In April 1942, the United States conducted what is now known as the "Old Man's" draft registration. This registration was for men who were born between 1877 and 1897 - those who were 45-60 years old. The intent of this registration was to record the amount of domestic manpower available for home front war support. Two of my great-grandfathers and two of my husband's great-grandfathers registered in this draft (click on pictures below for larger images). Each card lists the registrant's name, home address, date and place of birth, name and address of employer, and a person of close contact (usually a wife, sibling or parent). The second page of the card also lists physical characteristics of the applicant. Because this occurred in 1942, these cards are a great way of keeping track of where your ancestors lived and worked in between the 1940 and 1950 U.S. Censuses. Try looking up one of your relatives at FamilySearch.org.